It is also possible to make an SFX archive as the first of a
multi-volume sequence, but it should be noted that the size will be
larger by the amount of the SFX module. Should SFX volumes be
created using the command a with
the switches: -v[<size>] -sfx, then you do not need to ensure
the volume size - the first volume will be automatically created
with the correct size.

Example

WinRAR s diamant

By default, WinRAR uses for RAR archives SFX module file
default.sfx, which must exist in the same
folder as winrar.exe and, for ZIP archives, zip.sfx module. It is possible to
specify, in the "s" command, an alternate SFX module name.